@media (max-width: 600px) {
  .nav nav a[href="/"] { display: none; }
  .nav nav { gap: 14px; }
  .brand { flex: 0 0 auto; }
}

.chart-card { position: relative; }
.chart-tooltip { position: absolute; z-index: 3; transform: translate(-50%, -100%); min-width: 160px; padding: 10px 12px; border: 1px solid var(--participant-color); border-radius: 8px; background: #0b0e12eb; box-shadow: 0 8px 28px #0009; pointer-events: none; }
.chart-tooltip strong, .chart-tooltip span, .chart-tooltip small { display: block; }
.chart-tooltip strong { font-size: 12px; }
.chart-tooltip span { margin-top: 3px; color: var(--participant-color); font: 800 15px ui-monospace, monospace; }
.chart-tooltip small { margin-top: 4px; color: var(--muted); font-size: 9px; }